Tube-bending machine.



2 SHEETS-SHEET I Patented Get. 29, i918..

W. P. FRANK.

TUBE BENDING MACHINE.

APPLICATION FILI-:n IuNEzs. |9111 Patented oet. 29, 1918.

2 SHEET$-SHEET 2.

, m@ v Y .www w WIMNI @afd/z wie' Milf/@5% w d fm www a f@ wg@ WILLIAM P. FRANK, 0F CHICAGO, ILLINOIS.

To all whom z'i may concern.'

Be it known thatLWViLLiAM P. FRANK, a citizen of the VUnited States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Tube-Bending Machines, of which the following is a speciiiCatiOn.

My invention relates to improvements in tube bending machines, and has for itsobject the provision of an improved machine `ofthis character by means of which tubes may be readily bent in different forms with- 'machine embodying my invention,

Fig. 2 a sideview of the `same,but show-V ing the Vbending lever in full lines in initial position instead of in terminal position, Fig. 3, a section takenon line 3'-3 of Fig. 2, but showing the bending lever in terminal position, y

Fig. 4, a top plan view of a machine shown as employed 11i bending` a tube which already has one bend therein,

Fig. 5, atop plan view corresponding with Fig. 4 with portions removed and showing the bending lever in terminal position after the bending,

Fig. 6, a section taken on line 6-6 of Fig.

. 4, and i Fig. 7, a section taken on lineb7-r-7 of,

Fig. 4. p

The `preferred form of construction, as illustrated in the drawings, `comprises a suitable baseplate 10 adaptedto be secured in a vise or Vthe like, said base platebeingprovided centrally at one side with, a. grooved die member lladapted to receive atube 12 to be bent. A stop or gage member 13 is detachably secured tothe upper faceof plate 10, and is provided with an upstanding i notched ilange 14 adapted to receive the endV of tube 12, said tube being locked against longitudinal movement by passing a pin l5 Specication of Letters Patent.

TUBE-BENDING MACHINE.

Patented Get. 29, 1918.,

Appleationfiled il'une 26, 1917. Serial No. 176,960.

through a perforation in the end thereof. A die head 16 is removably arranged on base plate l() to coperate with guide 11, said die head being positioned on a removable stud 17 fitting through a suitable hole in said base plate. A bending lever 18 is pivotally mounted a lateral extension 19 havinga grooved die member 20 pivoted thereon at 21 in position to coperate with bending head 16.4 The die member A20 is secured by a screw bolt 22 to a supplemental lever 28 also pivoted at 21, said screwjbolt 22 passing through an enlarged hole 24 in the lateral extension 19 so as to permit of limited rocking of the die member 20 and lever 23, with reference to the lever 18 and the bending head 16. Lever 23 carries a depending bracket 25 on which is mounted a rod 26 adjustably secured to saidbracket bymeans of lock nuts 27 as indicated.v Rod 26 carries a plug 28 insertible in the end of tube 12 as indicated. A handle lever 29 is pivoted on lever 18 at 29 and has a slotted end 30 loosely engaging a headed stud 31 on lever 23, .the arrangement being such that initial force applied to handle lever 29 first rocks the die member20 into close cooperation with bending head 16 before causing the bending lever 18 tosweep around the stud 17 and bending liead'16.

,In use the parts are first disassembled -and a tube to be bent placed over plug 28 and rod 26, whereupon the parts are assembled with said tube fitting the groove in guide 11 and the notch in liange 14, the corresponding end of the tube being perforated and a to lock said tube against longitudinal movenient. Then the lever 18 and its associated parts are swept around bending head 16 by means of handle lever 29. This causes the tube to be nicely bent against the bending head 16, the plug 28 always traveling in said tube substantially tangent to head 16 at the place. By this arrangement,` the tube will be nicely bent without buckling or other distortion and Vvery expeditiously. To remove the bent tube the stud 17 isfirst removed, whereupon tlie parts may be readily disassembledand the bentftube removed. A

on stud 17 and carriesl pin 15 being passed therethrough place where the bending takes i has already had one end thereof bent, I insert a grooved block 32 having a groove 32 therein shaped to fit the bend 12 in said tube as best indicated in Figs. l to 7 inclusive. The groove 32V in the groove 32 is inclined With reference to the groove in bending head 16v as indicated in Fig. 6, and simply rests against the flattened portion 33 of the bending head 1G. By this arrangement, it Will be observed that a tube having the bend 12 therein may be again bent in a plane at an angle to the plane of bend 12 thus forming a part adapted for use in ordinary bugles'.

TWhile l have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification Without departing from the spirit of the invention. I, therefc'ire7 do not Wish to be limited tothe precise details of construction set forth, but

desire to avail myself of such variations and modifications as come Within the scope of the appended claims. l

Having described my invention What l claim as nevv anddesire to secure by Letters Patent is:

1. A tube bending machine with said head; a supplemental bending le- -ver pivotally mounted on said lever; a die member carried by said supplemental bending lever and cooperating With said head; and a handle lever pivoted on said bending lever and operatively connected with said supplemental lever to press said die member against said head in operating said bending lever, substantially as described.

2. A tube bending machine comprising a bending head; a bending lever copeiating with said head; a supplemental bending lever ivotally mounted on said lever;a die mein er carried by said supplemental bending lever and cooperating with said head; a handle lever pivoted on said bending lever and operativelyconnected With said supplemental lever to press said die member against said head in operating said bending lever;

and a plug carried by said supplemental le- Vwith said head; a supplemental lever pivotally mounted on said bending lever; a die member vcarried by said supplemental bending lever and cooperating Withsaid head; a handle lever pivoted on said bending lever and having a slot and pinconnection with comprising a bending head; a bending lever cooperating said supplemental lever arranged to press said die member against said head in operationof said bending lever; and a plug carried .by said supplemental lever and inseri'iii ble in a tube operated on said dieV member and head, substantially as described.

1l. A tube bending machine comprising a grooved bending head; a bending lever cooperating with said head; a plug carried by said lever and insertible in a tube operated on by said lever and head; -and afgrooved bloclr cooperating with said head and adapted to receive a bend in a tube the groove in said block being inclined With reference to scribed. Y

the groove Vin said head, substantially as de- 5. A tube bending machine comprising a grooved bending head; a bending lever cooperating ivith said head; a grooved die member carried by lsaid lever and coperat- Y ing With said head; a plug cai'ried by said lever and insertible in a tube operated on by said die memberand head; and a grooved block cooperating with said head and adapt-- ed to receive a bend in a tube the groove in said block being inclinedivith reference `to the groove in said head, substantially as described.

6. A tube bending machine comprising a grooved bending head; a bending lever `cooperating With said head; a die member carried by'said lever and coperating with said head; a handle levercarried by said bending lever and operatively connected with said die member to throiv said die member into close cooperation with said head; al plug carried by said lever and iiisertible in a `tube operated on by said die member and head; Y

and a grooved blockcooperating with said head and adapted'to receive a. bend in a tube the groove in said block 4being `inclined with reference to the groove in said head, substantially as described. K

7. A tube bending machine comprising a grooved bending head; a bending lever cooperating With said head; a plug `carried byV said lever and insertible in a tube operated on by said lever and head;and a grooved block cooperating with said head and adapted to receive a bend ina tube, the groove in said block lying in a different plane from that in said head, substantially as described.V

In testimony whereof VI have signed -my name to this speciiicationin the presence of tvvo subscribing Witnesses. t f WILLIAM VP-FRANIL Witnesses: Y

- JOSHUA R; H. PoTTs,

HELEN F. LILLIs.

Copies of this patent may be obtained for 'five cents each, by addressing the Commissioner ofl'atents. Y Washington, D. G. 

